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Dorman - First Stop Brake Master Cylinder P/N:M39950
$82.99
Turn pedal pressure into the hydraulic force that stops your vehicle with the Dorman - First Stop Brake Master Cylinder M39950. It installs as a direct-fit replacement for the listed applications, including the 1991 and 1993 Ford Escort, the 1991 and 1993 Mercury Tracer, the 1990-1994 Mazda 323, the 1992-1995 Mazda MX-3, and the 1990-1994 Mazda Protege.
The master cylinder is the hydraulic heart of the brake system: when you press the pedal, its internal pistons move through the cylinder bore and pressurize the brake fluid, sending it through the lines to the wheel-end braking components.
- Core braking function: converts brake-pedal input into the hydraulic pressure that operates the brakes.
- Fluid-side component: works with brake fluid only — not oil or coolant.
- Direct-fit design: intended to replace the original unit on the listed applications.
Signs that a master cylinder may need replacing include a brake pedal that slowly sinks under steady foot pressure, a soft or spongy pedal, or brake fluid seeping from the unit. Because these symptoms can have other causes, diagnose the system before replacing — if a failed master cylinder is the cause, this replaces it.
Manufacturer part number M39950.
Frequently Asked Questions
What does this master cylinder do?
When you press the brake pedal, its internal pistons pressurize the brake fluid and send it through the lines to the wheel-end braking components, providing the hydraulic force that stops the vehicle.
Which vehicles does the M39950 fit?
It fits the 1991 and 1993 Ford Escort, the 1991 and 1993 Mercury Tracer, the 1990-1994 Mazda 323, the 1992-1995 Mazda MX-3, and the 1990-1994 Mazda Protege. See the Buyer's Guide tab to confirm your vehicle.
What are the signs of a failing master cylinder?
Common signs include a brake pedal that slowly sinks under steady pressure, a soft or spongy pedal, or brake fluid seeping from the unit. Diagnose the system, since these symptoms can have other causes.
What type of fluid does it use?
A master cylinder is a brake-fluid component. It works only with brake fluid, not engine oil or coolant. Use the brake fluid specified in your vehicle's service information.
Should I bleed the brakes after installing it?
Yes. After replacing a master cylinder, the brake system typically needs to be bled to remove trapped air. Follow the procedure in your vehicle's service information.
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Dorman - First Stop Brake Master Cylinder P/N:M39950
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